Preparations for the launch of Shuttle Discovery continue on schedule. At the launch pad, ordnance installation and pressurization of the orbiter's maneuvering and reaction control systems are complete. Discovery's aft compartment closeouts continue with the aft compartment doors slated for installation early tomorrow morning. Routine prelaunch inspections of the external tank and solid rocket boosters are in work today. Payload bay closeouts conclude today and the payload bay doors will be closed for flight tonight.